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Mechanical properties of proton exchange membrane at different strain rates and temperatures

机译：不同应变速率和温度下质子交换膜的力学性能

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Proton exchange membrane (PEM) is an important part of proton exchange membrane fuel cells (PEMFCs).The evaluations of PEM are mainly focused on the conductivity and methanol diffusion resistance.There are few studies on mechanical properties and reliability of PEM.In this study,the stress-strain behavior,creep-recovery behavior and stress-relaxation behavior of PEM at different strain rates and temperatures have been obtained on Dynamic Mechanical Analyzer.Strain controlled tensile tests were conducted at different strain rates of 0.1%/s,1%/s and 8%/s and five different temperatures of-30℃,0℃,30℃,55℃ and 85℃.There are three phases in tensile stress-strain curves of membrane samples,i.e.linear elastic,nonlinear hardening,and linear hardening.Creep-recovery tests were conducted with the stress level of 2MPa,4MPa,6MPa and 8MPa,and with the temperature of 30℃,55℃ and 85℃.Creep strain increases rapidly as the stress increases.The phenomenon is more obvious at high temperature especially.Creep strain increases rapidly as the temperature increases at the same stress and creep time.Stress-relaxation curves at strain of 10%,50%,100% and the environment temperature of 30℃,55℃,85℃ were conducted.The larger the initial strain,the higher the initial stress.The stress decreases rapidly at beginning,and then the change becomes more and more gentle.
机译：质子交换膜（PEM）是质子交换膜燃料电池（PEMFC）的重要组成部分，对PEM的评价主要集中在电导率和抗甲醇扩散性方面，对PEM的力学性能和可靠性的研究很少。在动态力学分析仪上获得了PEM在不同应变速率和温度下的应力-应变行为，蠕变恢复行为和应力松弛行为。以0.1％/ s，1％的不同应变率进行了应变控制的拉伸试验/ s和8％/ s以及-30℃，0℃，30℃，55℃和85℃的五个不同温度。膜样品的拉伸应力-应变曲线分为三相，即线性弹性，非线性硬化和在2MPa，4MPa，6MPa和8MPa的应力水平，温度30℃，55℃和85℃的条件下进行了蠕变恢复试验。随着应力的增加，蠕变应变迅速增加，这种现象更加明显。特别是在高温下在相同的应力和蠕变时间下，随着温度的升高，深度应变迅速增加。在10％，50％，100％应变和30℃，55℃，85℃的环境温度下，应力松弛曲线出现。初始应变越高，初始应力越高。应力在开始时迅速减小，然后变化变得越来越平缓。

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